It prepares the output string based on the boolean value returned. It returns Boolean true if the passed element is found on the array. This function receives a string and applies array.includes() on it. It defines a custom function checkOption() to form a condition using includes(). This example contains an array of 4 strings. Search array element using Includes in JavaScript To invoke includes() as a generic method.To use includes with a positive or negative fromIndex parameter.To search array if a specified element exists or not.
This article includes 4 examples to see how to use JavaScript includes(). Examples for using includes in JavaScript Visit the linked article to know the other array prototype methods in JavaScript. To make the select, checkbox, radio options selected if the options found in the haystack.To highlight the keyword in the search result, if the includes in JavaScript returns true.To form a conditional code block based on the presence of the search element in an array or string.The includes in JavaScript can be used for many scenarios. The () will not search for a sub-array.The negative value is not applicable for the includes() in the String prototype.It can also be called as a generic method.JavaScript includes() searches array or string with case sensitivity.It returns boolean true if any match is found or false otherwise. With a negative value, it applies this formula to compute the position to start.įromIndex = arrayLength + signedFromIndex The fromIndex is optional and its default value is 0 to start with. It has two parameters, searchElement and fromIndex. Syntax, parameters and return value includes(searchElement, ) In the string prototype, the includes() in JavaScript checks if the given value is the substring. In an array context, it checks the given value is one among the array elements. It checks if an array or string includes a given value. InputString.includes('learn','8') //returns false InputString.includes('learn') //returns true InputString = 'How to learn JavaScript?' InputArray.includes('Delete','-1') //returns false InputArray.includes('Error') //returns false InputArray.includes('Read','3') //returns false InputArray.includes('Read') //returns true
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